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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 2
 4
 1
 8

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

All of these
 BRY
 BYR
 RBY

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 220 V
 6 V
 more than 220 V
 somewhat less than 220 V

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 90 %
 Any where between 75 % and 90 %.
 Around 100 %.
 Less than 50 %

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 fixing the brush axis inline with the pole axis.
 shifting the brush axis from GNA to MNA.
  compensating winding and commutating poles.
 increasing field excitation.

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 Fractional horse power slow speed motor.
 50 MW generator in a power plant.
 Fractional horse power high speed motor.
  Hermetically sealed motor of refrigerator.

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